We are pleased to announce the first edition of this year's Theme 3 Colloquium, which will take place on Tuesday 11 AM, September 24, 2024 (LIN6). Our speaker will be Mathias Kläui, an expert in nanomagnetism from the Institute of Physics, Johannes Gutenberg University Mainz.
Please note that this colloquium will take place prior to the regular IMM colloquium, which is scheduled for 16:00.
Speaker
Mathias Kläui - Institute of Physics, Johannes Gutenberg, University Mainz.
Time & Location
Tuesday 24 September 2024, 11.00 AM
Linnaeus Building, LIN6
Title & Abstract
From antiferromagnets to altermagnets: functionalizing novel magnetic phases
Mathias Kläui1,2
1Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
2Center for Quantum Spintronics, Norwegian University of Science and Technology, 7491 Trondheim, Norway
While known for a long time, antiferromagnetically ordered systems have previously been considered, as “interesting but useless”. However, since antiferromagnets potentially promises faster operation, enhanced stability and higher integration densities, they could potentially become a game changer for new spintronic devices. Here we show how antiferromagnets can be used as active spintronics devices by demonstrating the key operations of “reading” [1], “writing” [2], and “transporting information” [3] in antiferromagnets.
Going beyond antiferromagnets, we develop altermagnetic materials [4,5]. This recently identified class magnets with collinear antiferromagnetic magnetic order can exhibit spin splitting and particular spin transport properties and torques [4]. Here we demonstrate the spin splitting in RuO2 and CrSb [5] und analyze particular symmetries of the Hall signal in the altermagnet hematite [6].
Reference
[1] S. Bodnar et al., Nature Comm. 9, 348 (2018); S. Bommanaboyena et al., Nature Comm. 12, 6539 (2021).
[2] H. Meer et al., Nano Lett. 21, 114 (2020); S. P. Bommanaboyena et al., Nature Commun. 12, 6539 (2021); C. Schmitt et al., Nano Lett. 24, 1471 (2024).
[3] R. Lebrun et al., Nature 561, 222 (2018). R. Lebrun et al., Nature Commun. 11, 6332 (2020). S. Das et al., Nature Commun. 13, 6140 (2022).
[4] L. Smejkal et al., Phys. Rev. X 12, 040501 (2022).
[5] O. Fedchenko et al., Sci Adv. 10, adj4883 (2024); S. Reimers et al., Nature Commun. 15, 2116 (2024).
[6] E. Galindez-Ruales et al., arxiv:2310.16907
